/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { ts, rule, CallExpression } from "qvog-dsl";

const SEVERITY = 2;
const DOC_PATH = 'docs/no-math-random-in-loop.md';
const DESCRIPTION = 'Avoid calling Math.random inside loops; it may lead to performance or security issues.';

export default rule()
  .match(CallExpression)
  .when(node => {
      // 判断是不是 Math.random
      if (!ts.isPropertyAccessExpression(node.expression)) { return false };
      const expr = node.expression;
      const isMathRandom = expr.expression.getText() === 'Math' && expr.name.getText() === 'random';
      if (!isMathRandom) return false;

      // 判断父节点是否在循环里
      let parent = node.parent;
      while (parent) {
          if (ts.isForStatement(parent) || ts.isWhileStatement(parent) || ts.isDoStatement(parent) || ts.isForOfStatement(parent) || ts.isForInStatement(parent)) {
              return true;
          }
          parent = parent.parent;
      }

      return false;
  })
  .report({
      severity: SEVERITY,
      description: DESCRIPTION,
      docPath: DOC_PATH,
  });
